TROUBLESHOOTING GUIDE
D-6
NO ANALOG AUDIO ON
PLAYBACK
Is there AUDIO signal at
pin 7 and 8 of IC7301.
Yes
Is there waveform at
pin 1, 2 and 3 of
IC7301 ?
Yes
Check J8004 and peripheral
circuit.
Yes
No
No
Check AT+3.3V and AT+5V.
Change IC4001.
No
Is there voltage at pin 5 of
IC7301 about 3.3V and at
pin 6 of IC7301 about 5V ?
Yes
Change IC7301.
Is there voltageat pin 3
of IC4003 about 1.9V ?
Change IC4003.
No